您要查找的是不是：
- His area of concentration is nuclear physics. 他的专门研究范围是原子物理学。
- The drug affects one's power(s) of concentration. 这种药影响人精神不能集中。
- Stress and tiredness often result in a lack of concentration. 紧张和疲劳常使人精神不集中。
- He is in charge of the operation of the steel mill. 他负责这家钢厂的经营工作。
- An exam demands a high level of concentration. 考试时需要全神贯注。
- The holder or operator of a concession. 权利的受让人特许权的拥有者或实行者
- The drug may affect your powers of concentration. 这种药可能会影响你的注意力集中。
- This book requires a great deal of concentration. 这本书需要全神贯注才能读懂。
- The operator of one of these machines. 照相排版(字)机员这些机器之一的操作者
- He is a boy with little power of concentration. 他是个注意不易集中的男孩。
- The operation of a railroad needs many men. 铁路的营运需要很多人。
- He has great powers of concentration. 他注意力很集中。
- The operation of natural law is constant. 自然法则的作用是永恒的。
- The operation of this machine is simple. 这个机器的操作很简单。
- His area of concentration is economics. 他专心研究经济学。
- The Determination of Concentration for SO_2 Gase. SO_2气体浓度的测定
- The act or operation of melting. 融化过程进行熔解的行动或过程
- Operator of the shou: GUANGZHOU CHINA BO EXHIBITION CO., LTD. 展会运营商:广州市精博展览有限公司。
- A gate that performs the Boolean operation of implication. 执行“蕴含”布尔操作的一种(逻辑)门电路。
- She personally directs the operations of the company. 她亲自指挥公司的运作。
